Magnetic adsorption type heat pipe

Abstract

The utility model discloses a magnetic adsorption type heat pipe, and belongs to the technical field of heat pipes. The heat pipe comprises a pipe shell, a pipe core and a steam cavity, and further comprises a magnetic adsorption body and a weldable coating. The material of the magnetic adsorber is selected from iron, cobalt, copper-iron alloy or permanent magnet material, and the structure of the magnetic adsorber is any one of the following: a cylinder axially arranged in the steam cavity, the outer diameter D of which is 0.3-0.8 time of the diameter D of the steam cavity; the outer surface of the tube shell is covered with the plating layer, and the thickness of the plating layer is 50-2000 nm; and the strip-shaped or micro-magnetic block array is attached to the outer wall of the tube shell. The weldable coating material is selected from silver, gold, nickel, copper, palladium or palladium-nickel alloy, the thickness of the weldable coating material is 100-1000 nm, and the weldable coating material covers the outer surface of the tube shell or the outer surface of the magnetic adsorption body according to different structures of the magnetic adsorption body. The magnetic adsorption body is integrated on the heat pipe, so that the heat pipe can be firmly fixed at the bottom of the heat pipe groove by magnetic force during welding, and the problem that the heat pipe floats upwards in the welding process is effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of heat pipe technology, and in particular to a magnetic adsorption type heat pipe. Background Technology

[0002] Heat pipes have a thermal conductivity more than 100 times that of ordinary metals. This superior conductivity has led to the increasingly widespread application of heat pipe radiators in electronic devices, making heat pipe cooling technology a crucial technology for efficient heat dissipation in electronic equipment. A heat pipe radiator is a type of radiator where heat pipes are embedded into a metal substrate through welding. It boasts advantages such as high heat transfer efficiency, low cost, mature technology, and short production cycle, making it suitable for products that eliminate single-point heat sources or have high single-point heat source power. Currently, heat pipe radiators typically employ a low-temperature brazing process, where the heat pipe is embedded in a heat pipe groove and then coated with a low-temperature brazing filler metal for welding. However, the current process is complex, resulting in a relatively low product yield. This is because problems such as heat pipe floating during welding can lead to performance degradation or even product failure.

[0003] To address this issue, patent 202420230185.4 proposes a fixed heat pipe, comprising two parts: a heat pipe and a solder / reactive nano-multilayer film / solder sandwich coating. Patent 202420230188.8 proposes a fixed heat pipe with a coating, comprising three parts: a heat pipe, a coating, and solder / reactive nano-multilayer film / solder sandwich coating. Both patents utilize reactive nano-multilayer films, which can undergo a self-propagating reaction under the induction of external energy. The exothermic reaction instantly melts the solder, directly connecting the heat pipe to the bottom of the heat pipe trench. Due to the thinness of the reactive nano-multilayer film, its extremely fast cooling rate ensures that the heat pipe structure is not damaged. By fixing the fixed heat pipe to the bottom of the heat pipe trench, the problem of heat pipe floating during subsequent heat pipe radiator welding is completely solved. However, the preparation cost of reactive nano-multilayer films is very high, seriously affecting the use and promotion of this method.

[0004] Patent 202420199198.X proposes a heat pipe radiator welding device based on thermal convection and thermal radiation. The principle is that after the copper heat pipe is nickel-plated, the nickel-plated heat pipe is always firmly fixed in the bottom of the heat pipe groove due to the electromagnetic attraction force generated by the electromagnetic device after being energized. This avoids the need for mechanical fixing methods that affect the thermal performance of the heat pipe in the traditional method.

[0005] Patent 202323524143.6 proposes a tooling for welding heat pipe radiators. The principle is that the nickel-plated heat pipe is firmly fixed to the bottom of the heat pipe groove under the magnetic attraction of the tooling, thereby completely avoiding the problems of product performance degradation or even scrapping caused by the heat pipe floating during the traditional heat pipe radiator welding process.

[0006] The effectiveness of the two patents mentioned above depends on the requirement that a layer of nickel must be plated on the surface of the heat pipe. Only after nickel plating can the heat pipe generate a fixing force that attracts it in a magnetic field. However, the saturation magnetism of nickel is much lower than that of iron / cobalt. In addition, the thickness of the nickel plating layer on the surface of the heat pipe is generally on the micrometer level. Therefore, the nickel plating layer on the surface of the heat pipe makes its attraction force in a magnetic field very weak, which seriously affects the ability to generate a sufficiently large attraction force to fix the heat pipe in a magnetic field.

[0007] Therefore, how to generate a sufficiently strong adsorption force in a magnetic field to firmly fix the heat pipe to the bottom of the heat pipe tank without increasing costs is an urgent problem to be solved. Summary of the Invention

[0008] In view of this, in order to overcome the problems of product performance degradation or even scrapping caused by heat pipe floating during the welding process of heat pipe radiators, this utility model proposes a magnetic adsorption type heat pipe. By placing this new type of heat pipe at the bottom of the heat pipe groove, it is fixed to the bottom of the heat pipe groove under the magnetic adsorption, thereby completely solving the problem of heat pipe floating during the subsequent heat pipe radiator welding process.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a magnetic adsorption type heat pipe, comprising a shell, a core, and a vapor chamber, characterized in that it further comprises:

[0010] (1) A magnetic adsorbent, the material of which is selected from iron, cobalt, copper-iron alloy or permanent magnet material, and has any of the following structural configurations:

[0011] (a) A cylindrical structure, axially arranged in the steam chamber and coaxial with the steam chamber, with an outer diameter D satisfying 0.3D0≤D≤0.8D0, where D0 is the diameter of the steam chamber, and both ends are welded to the ends of the tube shell;

[0012] (b) A coating structure covering all or part of the outer surface of the tube shell, with a thickness of 50~2000 nm;

[0013] (c) Strip-shaped or micro-magnetic block arrays are attached to the outer wall of the tube shell;

[0014] (2) A solderable plating, the material of which is selected from silver, gold, nickel, copper, palladium or palladium-nickel alloy, and its configuration is as follows:

[0015] (i) When the magnetic adsorbent adopts a cylindrical structure, it covers the outer surface of the tube shell;

[0016] (ii) When the magnetic adsorbent adopts a coating structure or a strip / micro magnetic block array, it is coated on the outer surface of the magnetic adsorbent;

[0017] The thickness of the solderable coating is 100~1000nm.

[0018] Furthermore, the permanent magnet material is one of neodymium iron boron, samarium cobalt, or alnico.

[0019] Furthermore, when the magnetic adsorbent is a permanent magnet material, after the heat pipe welding is completed, a strong magnetic field opposite to the original magnetic field is applied by an electromagnet or a pulsed magnetic field generator to eliminate the residual magnetic force of the magnetic adsorbent.

[0020] Furthermore, the mass percentage of iron in the copper-iron alloy is ≥10%.

[0021] Furthermore, in (1)(a) above, when the magnetic adsorbent material is iron, its outer surface is provided with an anti-oxidation layer of nickel or copper with a thickness of 100~500nm.

[0022] Furthermore, in (1)(b) above, the thickness of the magnetic adsorbent coating is 200~1000nm.

[0023] Furthermore, in (1) and (c) above, the width of the strip magnetic adsorbent is 1-5 mm and the thickness is 0.1-1 mm; the individual size of the micro magnetic block array is 0.5-2 mm³ and the array spacing is 1-3 mm.

[0024] Furthermore, the thickness of the solderable coating is 200~500nm.

[0025] Furthermore, the magnetic field strength of the strong magnetic field is 1.5 to 3 times the coercivity of the magnetic adsorbent.

[0026] Furthermore, the pulse width of the pulsed magnetic field generator is 1~10ms, and the pulse interval is 10~100ms.

[0027] The beneficial effects of adopting the above technical solution in this utility model are as follows:

[0028] (1) Thermal conductivity: In traditional schemes, nickel plating is required on the surface of the heat pipe to ensure its adsorption in a magnetic field. However, pure nickel (90 W / (m·k)), Ni-Fe alloy (50 W / (m·k)) and Ni-P alloy (50 W / (m·k)) have poor thermal conductivity, which will reduce the overall thermal conductivity of the copper heat pipe. The magnetic adsorbent materials selected in this invention, such as Fe (80 W / (m·k)), Co (100 W / (m·k)) and Cu-Fe alloy (200 W / (m·k)), have thermal conductivity that is better than or close to that of pure nickel. Moreover, the magnetic adsorbent is set with an extremely thin coating or a specific structure, which has minimal impact on the thermal conductivity of the copper tube shell substrate.

[0029] (2) Ferromagnetic properties: Pure nickel, Ni-Fe and Ni-P alloys are all ferromagnetic and can be attracted by magnets. However, the saturation magnetic strength of Fe, Co and Cu-Fe is much higher than that of pure nickel, Ni-Fe and Ni-P alloys, and their adsorption force is stronger;

[0030] (3) Magnetic adsorbent and solderable coating are designed on the structure of traditional heat pipe. In the magnetic environment, the magnetic adsorbent is subjected to adsorption force and thus fixes the heat pipe. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of a magnetic adsorption type heat pipe structure in which the magnetic adsorbent is a cylindrical structure.

[0032] Figure 2 This is a schematic diagram of a magnetic adsorption type heat pipe structure in which the magnetic adsorbent is a coating structure covering the entire outer surface of the tube shell.

[0033] Figure 3 This is a schematic diagram of a magnetic adsorption type heat pipe structure in which the magnetic adsorbent is a strip-shaped permanent magnet material attached to the outer wall of the pipe shell.

[0034] Among them, 1 is the tube shell, 2 is the tube core, 3 is the steam chamber, 4 is the magnetic adsorbent, and 5 is the weldable coating. Detailed Implementation

[0035] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0036] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Example 1: A magnetically adsorbed heat pipe, comprising a shell, a core, and a vapor chamber, and further comprising:

[0038] (1) Magnetic adsorbent, made of iron, cylindrical in shape, axially arranged in the steam chamber and coaxial with the steam chamber, with outer diameter D satisfying D=0.4D0 (D0 is the diameter of the steam chamber), and both ends are welded to the ends of the tube shell;

[0039] (2) A solderable coating, made of nickel, covers the outer surface of the tube shell. The thickness of the solderable coating is 500 nm.

[0040] Furthermore, when the magnetic adsorbent material is iron, its outer surface is provided with a copper anti-oxidation layer with a thickness of 500nm.

[0041] Example 2: A magnetically adsorbed heat pipe, comprising a shell, a core, and a vapor chamber, further comprising:

[0042] (1) Magnetic adsorbent, the material of which is iron, has a coating structure, covering the entire area of ​​the outer surface of the tube shell, with a thickness of 1000nm;

[0043] (2) A solderable coating, the material of which is nickel, is coated on the outer surface of the magnetic adsorbent body, and the thickness of the solderable coating is 500 nm.

[0044] Example 3: A magnetically adsorbed heat pipe, comprising a shell, a core, and a vapor chamber, further comprising:

[0045] (1) Magnetic adsorbent, the material of which is permanent magnet material, is attached to the outer wall of the tube shell in strip shape;

[0046] (2) A solderable coating, made of nickel, is applied to the outer surface of the magnetic adsorbent. The thickness of the solderable coating is 500 nm.

[0047] Furthermore, the permanent magnet material is samarium cobalt.

[0048] Furthermore, when the magnetic adsorbent is a permanent magnet material, after the heat pipe welding is completed, a strong magnetic field opposite to the original magnetic field is applied by an electromagnet or a pulsed magnetic field generator to eliminate the residual magnetic force of the magnetic adsorbent.

[0049] Furthermore, the strip-shaped magnetic adsorbent has a width of 3 mm and a thickness of 0.5 mm.

[0050] Furthermore, the magnetic field strength of the strong magnetic field is twice the coercivity of the magnetic adsorbent.

[0051] Furthermore, the pulse width of the pulsed magnetic field generator is 5ms, and the pulse interval is 50ms.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A magnetically adsorption type heat pipe, comprising a shell, a core, and a vapor chamber, characterized in that, Also includes: (1) A magnetic adsorbent, the material of which is selected from iron, cobalt, copper-iron alloy or permanent magnet material, and has any of the following structural configurations: (a) A cylindrical structure, axially arranged in the steam chamber and coaxial with the steam chamber, with an outer diameter D satisfying 0.3D0≤D≤0.8D0, where D0 is the diameter of the steam chamber, and both ends are welded to the ends of the tube shell; (b) A coating structure covering all or part of the outer surface of the tube shell, with a thickness of 50~2000 nm; (c) Strip-shaped or micro-magnetic block arrays are attached to the outer wall of the tube shell; (2) A solderable plating, the material of which is selected from silver, gold, nickel, copper, palladium or palladium-nickel alloy, and its configuration is as follows: (i) When the magnetic adsorbent adopts a cylindrical structure, it covers the outer surface of the tube shell; (ii) When the magnetic adsorbent adopts a coating structure or a strip / micro magnetic block array, it is coated on the outer surface of the magnetic adsorbent; The thickness of the solderable coating is 100~1000nm.

2. The magnetic adsorption type heat pipe according to claim 1, characterized in that: The permanent magnet material is one of neodymium iron boron, samarium cobalt, or alnico.

3. The magnetic adsorption type heat pipe according to claim 1, characterized in that: When the magnetic adsorbent is a permanent magnet material, after the heat pipe is welded, a strong magnetic field opposite to the original magnetic field is applied by an electromagnet or a pulsed magnetic field generator to eliminate the residual magnetic force of the magnetic adsorbent.

4. The magnetic adsorption type heat pipe according to claim 1, characterized in that: When the magnetic adsorbent adopts a cylindrical structure and its material is iron, its outer surface is provided with an anti-oxidation layer of nickel or copper with a thickness of 100~500nm.

5. The magnetic adsorption type heat pipe according to claim 1, characterized in that: When the magnetic adsorbent adopts a coating structure, its thickness is 200~1000nm.

6. The magnetic adsorption type heat pipe according to claim 1, characterized in that: When the magnetic adsorbent is a strip or a micro magnetic block array, the width of the strip magnetic adsorbent is 1~5mm and the thickness is 0.1~1mm; the individual size of the micro magnetic block array is 0.5~2mm³ and the array spacing is 1~3mm.

7. The magnetic adsorption type heat pipe according to claim 1, characterized in that: The thickness of the solderable coating is 200~500nm.

8. The magnetic adsorption type heat pipe according to claim 3, characterized in that: The magnetic field strength of the strong magnetic field is 1.5 to 3 times the coercivity of the magnetic adsorbent.

9. The magnetic adsorption type heat pipe according to claim 3, characterized in that: The pulse width of the pulsed magnetic field generator is 1~10ms, and the pulse interval is 10~100ms.

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